<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title="黑马头条"
    ></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div class="loading-wrap" v-if="isLoading">
        <van-loading
          color="#3296fa"
          vertical
        >加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div v-else-if="articleInfo.title" class="article-detail">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ articleInfo.title }}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="articleInfo.aut_photo"
          />
          <div slot="title" class="user-name">{{ articleInfo.aut_name }}</div>
          <div slot="label" class="publish-date">{{ articleInfo.pubdate | relativeTime }}</div>
          <!-- 关注组件 -->
          <!-- <FollowUser
          @update-is-followed="articleInfo.is_followed = $event"
          :aut-id="articleInfo.aut_id"
          :isFollowed="articleInfo.is_followed" /> -->
          <FollowUser
          v-model="articleInfo.is_followed"
          :aut-id="articleInfo.aut_id" />
          <!-- 代码解析 -->
          <!-- <FollowUser
          :value="articleInfo.is_followed"
          @input="articleInfo.is_followed = $event"
          :aut-id="articleInfo.aut_id" /> -->
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div ref="content" class="article-content" v-html="articleInfo.content"></div>
        <van-divider>正文结束</van-divider>
        <!-- 获取文章的评论 -->
        <ArticleComment @on-click-reply="onClickReply" :list="list" @on-response-success="onResponseSuccess" :source="articleInfo.art_id" />
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div v-else-if="is404" class="error-wrap">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button @click="loadArticle" class="retry-btn">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>

    <!-- 底部区域 -->
    <div v-if="articleInfo.title" class="article-bottom">
      <van-button
        class="comment-btn"
        type="default"
        round
        size="small"
        @click="showPostPopup = true"
      >写评论</van-button>
      <van-icon
        name="comment-o"
        :info="totalComment"
        color="#777"
      />
      <!-- 解析 -->
      <!-- :value="articleInfo.is_collected" -->
      <!-- @input="articleInfo.is_collected = $event" -->
      <ArticleCollect
      :artId="articleInfo.art_id"
      v-model="articleInfo.is_collected" />
      <van-icon
        color="#777"
        name="good-job-o"
      />
      <van-icon name="share" color="#777777"></van-icon>
    </div>
    <!-- /底部区域 -->

    <!-- 发布评论弹层 -->
    <van-popup v-model="showPostPopup" position="bottom">
      <CommentPost @on-post-success="onPostSuccess" :target="articleId" />
    </van-popup>

    <!-- 发布回复评论弹层 -->
    <van-popup style="height: 100%;" v-model="showPostReplyPopup" position="bottom">
      <CommentReply :articleId="articleId" v-if="showPostReplyPopup" @click-left="showPostReplyPopup = false" :comment="comment"/>
    </van-popup>
  </div>
</template>

<script>
import { getArticleById } from '@/api/articles.js'
import { ImagePreview } from 'vant'
import FollowUser from '@/components/follow-user.vue'
import ArticleCollect from './components/article-collected.vue'
import ArticleComment from './components/article-comment.vue'
import CommentPost from './components/comment-post.vue'
import CommentReply from './components/comment-reply.vue'
export default {
  data() {
    return {
      articleInfo: {}, // 存储详情数据
      isLoading: false,
      is404: false,
      totalComment: 0,
      showPostPopup: false,
      list: [],
      showPostReplyPopup: false,
      comment: {} // 点击回复子组件子组件传递的评论详情数据
    }
  },

  components: {
    FollowUser,
    ArticleCollect,
    ArticleComment,
    CommentPost,
    CommentReply
  },

  props: {
    articleId: {
      type: String,
      required: true
    }
  },

  created() {
    this.loadArticle()
  },

  methods: {
    // 加载详情数据
    async loadArticle() {
      this.isLoading = true
      try {
        const res = await getArticleById(this.articleId)
        // if (Math.random() > 0.5) {
        //   console.lg(12)
        // }
        this.articleInfo = res.data
        this.isLoading = false
        this.previewImg()
        this.$toast('获取成功')
      } catch (err) {
        this.isLoading = false
        if (err.response && err.response.status === 404) {
          this.is404 = true
        }
      }
    },
    // 图片预览
    previewImg() {
      this.$nextTick(() => {
        const content = this.$refs.content
        const imgs = content.querySelectorAll('img')
        const images = []
        imgs.forEach((item, index) => {
          images.push(item.src)
          item.onclick = function () {
            ImagePreview({
              images,
              startPosition: index
            })
          }
        })
      })
    },
    // 监听文章评论列表组件数据获取成功
    onResponseSuccess(res) {
      this.totalComment = res.total_count
    },
    // 监听发布评论成功
    onPostSuccess(data) {
      this.showPostPopup = false
      this.list.unshift(data)
    },
    // 监听子组件的子组件的点击回复事件
    onClickReply(comment) {
      this.comment = comment
      this.showPostReplyPopup = true
    }
  }
}
</script>

<style scoped lang="less">
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
